<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr
            v-for="(item,idx) in list"
            :key='item.id'
          >
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red:item.price>100}">{{item.price}}</td>
            <td>{{item.time | dateFormmate}}</td>
            <td><a
                href="#"
                @click.prevent="delFn(idx)"
              >删除</a></td>
          </tr>
          <tr style="background-color: #EEE">
            <td>统计:</td>
            <td colspan="2">总价钱为: {{ allPrice }}</td>
            <td colspan="2">平均价: {{ svgPrice }}</td>
          </tr>
        </tbody>

        <tfoot v-if="list.length !== 0">
          <tr>
            <td
              colspan="5"
              style="text-align: center"
            >暂无数据</td>
          </tr>
        </tfoot>

      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="number"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button
          class="btn btn-primary"
          @click.prevent='addFn'
        >添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from 'moment'
export default {
  data () {
    return {
      name: "", // 名称
      price: 0, // 价格
      list: JSON.parse(localStorage.getItem('plist')) || []
    };
  },
  methods: {
    addFn () {
      if (this.name.trim().length == 0 || this.price === 0) {
        alert('不能为空。')
        return
      }
      let id = this.list.length === 0 ? 100 : this.list[this.list.length - 1].id + 1
      this.list.push({
        id: id,
        name: this.name,
        price: this.price,
        time: new Date()
      })
    },
    delFn (index) {
      this.list.splice(index, 1)
    }
  },
  filters: {
    dateFormmate (val) {
      return moment(val).format('YYYY-MM-DD')
    }
  },
  computed: {
    allPrice () {
      return this.list.reduce((sum, obj) => sum += obj.price, 0)
    },
    svgPrice () {
      return this.allPrice / this.list.length
    }
  },
  watch: {
    list: {
      handler () {
        localStorage.setItem('plist', JSON.stringify(this.list))
      },
      deep: true
    }
  }

};
</script>

<style >
.red {
  color: red;
}
</style>